The album consist theme songs used for anime television series Detective Conan.

In the early productions of the album, Kimi to no Furueai was possible candidate for the movie theme of Conan, however it was later replaced with Natsu wo Matsu Sail no You ni and original song became the part of the album recordings.

The album includes Sakai's self cover of her provided lyric song, Last Good-bye which was originally performed by Field of View and was released as a single in 1995 and Anata to Tomoni Ikiteyuku, originally performed by Taiwanese singer Teresa Teng and was released as a single in 1993.

Natsu wo Matsu Sail no Yō ni is the B-side of the 40th single.

[6] Composer from the Giza Studio, Aika Ohno covered Natsu wo Matsu Sail no You ni and Kakegae no Nai Mono in her album Silent Passage in 2013.